Letters of Interpretation

OSHA requirements are set by statute, standards, and regulations. Our interpretation letters explain these requirements and how they apply to particular circumstances, but they cannot create additional employer obligations. Each letter constitutes OSHA's interpretation of the requirements discussed.

Note that our enforcement guidance may be affected by changes to OSHA rules. Also, from time to time we update our guidance in response to new information.

These letters of interpretation and the standards they address may not apply to OSHA State Plans. State Plans are required to have standards and enforcement programs that are at least as effective as OSHA's and may have different or additional requirements. Please see OSHA-approved State Plans for more information.

NOTICE:

How to Request a Letter of Interpretation

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Date Title Standard Number
Petition for modification of OSHA's Methylene Chloride Standard 1910.1052
OSHA's Methylene Chloride Standard 1910.1052
OSHA's standard for exposure to bloodborne pathogens. 1910.1030
NIOSH approved respirator during the period of an employee's escape from a chemical release of phosgene. 1910.134(d)(1)(ii)
Sodium Azide as Used in the Manufacturing Process of Automobile Air Bags. 1910.109, 1910.119
Hydrogen fuel that is contained in fuel storage cylinders. 1910.103
OSHA's Methylene Chloride Standard 1910.1052
OSHA's Hazardous Waste Operations and Emergency Response Standard. 1910.120
OSHA's position on U.S. Environmental Protection Agency-approved disinfectants. 1910.1030
OSHA's Fixed Ladders and Safety Cages standard. 1910.27
Requirements for negative pressure rooms.
Control of hazardous energy (lockout/tagout) standard. 1910.147
Clarification o-f the electric power generation, transmission, and distribution standard. 1910.269
SCBA cylinder interchangeability. 1910.134(d)(1)(ii), 1910.156(f)(1)(iv), 1910.120(q)(3)(x)
Provisions of the Hazard Communication Standard. 1910.1200
SIC's excluded from OSHA occupational injury and illness recordkeeping. 1904 - Table of Contents
Internet use for posting Material Safety Data Sheets (MSDSs). 1910.1020
Removal of foreign bodies embedded in the eye is recordable. 1904 - Table of Contents
Association between toluene and Pierre Robin Syndrome. 1915.1000
Scaffolds used in the Construction Industry. 1926 - Table of Contents, 1926.451